Preheat your oven to 180°C / 350°F (fan-forced).
In a big bowl, toss the chicken with the sweetener, paprika and a pinch of sea salt to coat it.
Place a large baking dish (I use a cast iron one) on your stove top and over a low to moderate heat, sauté the onion in a little butter to ghee (or olive oil for dairy-free) until just translucent.
Push the onion to the side (away from the heat), turn up the heat and brown your chicken on all sides. Remove from the heat.
Add the bone broth, garlic, celery, carrots, potatoes, cumin, turmeric, rosemary and optional chilli flakes.
Gently mix it through the chicken and season again if needed.
Arrange the lemon wedges, flesh side down between the pieces of chicken. **** If your lemon has a really thick pith / white part (more than 5mm) then don't add as the pith can impart a bitter flavour to the pan juices. Instead add a little lemon juice to the pan juices after cooking.
Pop in the preheated oven and bake for 1 hour.